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Research progress of metal solid phase additive manufacturing based on friction stir
SHI Lei, LI Yang, XIAO Yichen, WU Chuansong, LIU Huijie
Journal of Materials Engineering    2022, 50 (1): 1-14.   DOI: 10.11868/j.issn.1001-4381.2021.000741
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Solid phase additive manufacturing based on friction stir is a new technology for manufacturing of large lightweight alloy components, which has become one of the hot research topics in advanced manufacturing field at home and abroad.The research status of metal solid phase additive manufacturing technology based on friction stir and related process mechanism were analyzed and summarized. The solid phase additive manufacturing technology based on friction stir can be divided into three categories.One is friction stir additive manufacturing(FSAM), which is based on the principle of friction stir lap welding, the plates are stacked layer by layer. Another is additive friction stir deposition(AFSD) technology, which usually uses a hollow tool to conduct AFSD by additive powder or wire through the hollow.The third one is friction surfacing deposition additive manufacturing (FSD-AM) technology, which is based on the principle of friction surfacing by using a rotating consumable bar to deposit materials to form the designed components. The research and application status of solid phase additive manufacturing technology of metal materials based on friction stir were analyzed, and the characteristics, advantages and disadvantages of three kinds of solid phase additive manufacturing technology based on friction stir were compared.Finally, the future research direction of solid phase additive manufacturing technology based on friction stir was proposed, including revealing their process mechanism, integrated controlling of the formation and property of the AM components, modifying the process assisted with second energy, application of new materials and optimization with artificial intelligence, etc.
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Progress in structure design and preparation of porous electrodes for lithium ion batteries
WANG Chenyang, ZHANG Anbang, CHANG Zenghua, WU Shuaijin, LIU Zhi, PANG Jing
Journal of Materials Engineering    2022, 50 (1): 67-79.   DOI: 10.11868/j.issn.1001-4381.2021.000021
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With the increasing demand for lithium-ion batteries, lithium-ion batteries with high energy density and high power density have become one of the research hotspots. Material modification and new material development can effectively increase the energy density of lithium-ion batteries. In addition, the microstructure parameters of the electrode such as porosity, pore size and distribution, tortuosity and electrode composition distribution are also factors that determine the performance of the electrode and battery. Improving the performance of high specific energy batteries by optimizing the electrode structure design has gradually become the focus of attention. The research progress of porous electrode structure design optimization for lithium ion batteries was reviewed in this article, the design factors and preparation methods of porous electrode structure were summarized. Then the future development of electrode structure design optimization and the promotion of novel preparation technologies for large-scale application in the field of high specific energy lithium ion batteries were prospected in the field of high specific energy lithium ion batteries.
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Research progress in wire arc additive manufacturing of aluminum alloys
Qifei HAN, Rui FU, Jinlong HU, Yueling GUO, Yafeng HAN, Junsheng WANG, Tao JI, Jiping LU, Changmeng LIU
Journal of Materials Engineering    2022, 50 (4): 62-73.   DOI: 10.11868/j.issn.1001-4381.2021.000343
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Wire arc additive manufacturing (WAAM) attracts much attention due to its unique feature of rapid near net shape forming without die. It has the potential to become an advanced manufacturing technology that can break the bottleneck of alloy development and industrial application for aluminum materials. Wire arc additive manufacturing technology originates from traditional arc welding, and both of them use high-energy arc as heat source and metal wires as raw material. The WAAM technology and equipment development, the solidification and solid state phase transformation performance, microstructures, metallurgical defects as well as mechanical property of aluminum alloys were reviewed. The technique prospects of hot wire and multi-wire additive manufacturing, the unique fabrication manner and the exclusive phase transformation microstructure were discussed. The WAAM-specialized approaches to address the issues of poor manufacturing accuracy, serious porosity and cracking, and unsatisfied mechanical property, including fabrication system development, metallurgical defect controlling, alloy composition and microstructure design and heat treatment optimization were proposed. Such proposals are expected to facilitate the rapid development of high-end, customized and distinguished aluminum alloys via WAAM.

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Research progress in tribological properties of high entropy alloys
Yuan YU, Zhuhui QIAO, Haibo REN, Weimin LIU
Journal of Materials Engineering    2022, 50 (3): 1-17.   DOI: 10.11868/j.issn.1001-4381.2021.000823
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In recent years, the sudden rise of high entropy alloys (HEAs) has become a hot research topic in the field of metal materials. The high entropy alloy is located in the central region of phase diagram, which has broad alloy composition space and possible formation of microstructure. The synergistic regulation of composition and preparation process can obtain richer structure. Unconventional chemical structure is expected to break through the performance limit of traditional anti-wear and lubricating alloys. In this work, the classification of wear-resistant HEAs was discussed. The effects of the addition of chemically active metals, soft metals and refractory metals on the wear resistance and lubrication properties of HEAs were analyzed. The effects of non-metallic elements and ceramic phases on the tribological properties of HEAs matrix composites were summarized. The effects of heat treatment and surface engineering technology on the surface microstructure and tribological behavior of HEAs were reviewed. The design method of HEAs with anti-wear lubrication under severe working conditions was discussed. The future research and application of HEAs in the field of friction and wear were prospected. High entropy alloys have great potential to solve the bottleneck problems of traditional alloys, such as to realize stable lubrication and anti-wear under extreme working conditions and to ensure anti-wear under specific functions.

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Research status of graphene oxide composite coatings on magnesium alloys
CHEN Yan-ning, WU Liang, CHEN Yong-hua, CHENG Ling, YAO Wen-hui, PAN Fu-sheng
Journal of Materials Engineering    2021, 49 (12): 1-13.   DOI: 10.11868/j.issn.1001-4381.2021.000291
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Magnesium alloy has the advantages of low density, good damping and noise reduction and good electrical conductivity. It is the lightest metal structural material in applications. However, they are easily corroded due to the low potential of magnesium alloy electrodes, which limits their wide application in industry. At present, surface coating protection technology is one of the most effective methods to improve the corrosion resistance of magnesium alloys. Graphene oxide (GO) has excellent thermal, mechanical and barrier properties, and has broad application prospects in metal protection. GO-based composite coatings can provide a good physical barrier to corrosive media and have become one of the candidate materials for anti-corrosion coatings. In this article, the solutions were proposed for the limitations of single-component GO nanosheets, such as agglomeration and poor compatibility. The preparation methods, types and corrosion protection research progress of GO composite coatings were mainly summarized and its protection mechanism was analyzed in depth. Finally, the future development trend of GO application of magnesium alloy surface corrosion protection coating were prospected. The preparation methods and types of GO composite coatings on magnesium alloys were mainly described. The research progress and corrosion protection mechanism of GO coating on magnesium alloy were summarized.
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Research progress in preparation and properties of refractory high entropy alloys
Xuan JIANG, Lin CHEN, Xuanhong HAO, Yueyi WANG, Xiaowei ZHANG, Hongxi LIU
Journal of Materials Engineering    2022, 50 (3): 33-42.   DOI: 10.11868/j.issn.1001-4381.2021.000582
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The meaning and characteristics of refractory high entropy alloys were briefly described, and the preparation methods of various refractory high entropy alloys (bulk, film and coating) were summarized.The comprehensive properties of refractory high entropy alloys were emphatically expounded. It was suggested that the composition design should be optimized by constructing a special database of refractory high entropy alloys, and the manufacturability of different preparation methods should be focused on. In view of the shortcomings of high room temperature brittleness, high density and high cost of refractory high entropy alloys at present, different preparation methods could be selected according to the properties of refractory high entropy alloys for future industrial application.

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Design, preparation and application of electrodes for flexible energy storage batteries
Ying HUANG, Chen CHEN, Chao LI, Jiaming WANG, Shuai ZHANG, Zheng ZHANG, Quanxing JIA, Mengwei LU, Xiaopeng HAN, Xiaogang GAO
Journal of Materials Engineering    2022, 50 (4): 1-14.   DOI: 10.11868/j.issn.1001-4381.2021.000512
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With the rapid development of portable and wearable electronic devices, research on flexible energy storage devices has gradually shifted to the directions of miniaturization, softness and intelligence. At the same time, people have higher requirements for the energy density, power density and mechanical properties of the device. As the core part of flexible energy storage devices, electrode material is the key to determining device performance. With the development of flexible energy storage electronic devices, there is an urgent need for new battery technology and fast, low cost and precise control of their microstructure preparation methods. Therefore, the research and development of new energy storage devices such as flexible lithium/sodium-ion batteries, flexible lithium-sulfur batteries, and flexible zinc-air batteries have become the current research hotspots in academia. The current research status of flexible energy storage battery electrodes in recent years was discussed in this paper, the design of flexible electrode materials (independent flexible electrodes and flexible substrate electrodes), and the preparation process of flexible electrode materials of different dimensions (one-dimensional materials, two-dimensional materials and three-dimensional materials) and applications of flexible energy storage electrodes (flexible lithium/sodium ion batteries, flexible lithium-sulfur batteries, flexible zinc-air batteries) were compared and analyzed, and the structural characteristics and electrochemical properties of electrode materials were discussed. Finally, the current problems faced by flexible energy storage devices were pointed out, and the future focus of flexible energy storage devices was the research and development of new solid electrolytes, the rational design of device structures and the continuous optimization of packaging technology.

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Research progress in wear resistance of high entropy alloy coatings prepared by laser cladding
Mingming JIANG, Shufeng SUN, Jin WANG, Pingping WANG, Xiaoyu SUN, Jing SHAO, Jixin LIU, Aixia CAO, Weili SUN, Xizhang CHEN
Journal of Materials Engineering    2022, 50 (3): 18-32.   DOI: 10.11868/j.issn.1001-4381.2021.000605
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The friction and wear of mechanical parts mainly occurs on the surface of the material, and about 80% of the failures of parts are caused by surface wear.Friction and wear increase the loss of material and energy, and reduce the reliability and safety.Using laser cladding technology to prepare a high entropy alloy coating on the surface of the substrate can achieve a good metallurgical combination between the coating and the substrate, so as to achieve the purpose of improving surface wear resistance.The main factors affecting the wear resistance of the high entropy alloy coating are the mechanical and physical properties of the coating material (such as hardness, plasticity and toughness), defects generated during the cladding process (such as surface roughness, pores and cracks), friction conditions (such as high temperature environment and corrosive environment).In this paper, the influencing factors and strengthening mechanism of laser cladding high entropy alloy coatings were reviewed and summarized.First of all, the influence of laser process parameters (such as laser power, laser scanning speed, spot diameter) and post-treatment processes (such as heat treatment and rolling) on the quality and performance of the coating were explained.Secondly, the influence of component element selection, high temperature environment and corrosive environment on the wear resistance of the coating was described.Finally, the problems existing in the preparation of high entropy alloy coatings by laser cladding technology were analyzed, and the future development trends were forecasted, such as developing new materials based on far-equilibrium material design theory, using electric field-magnetic field synergy or laser-ultrasonic vibration composite technology to improve the wear resistance of coatings, etc.

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Synthesis and properties of carbon nanofiber reinforced polyimide composite aerogels
ZHANG Ling, WANG Xue, LI Jiaqiang, LUO Chuyang, ZHANG Wei, ZHANG Liying
Journal of Materials Engineering    2022, 50 (1): 125-131.   DOI: 10.11868/j.issn.1001-4381.2021.000166
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4, 4'-diaminodiphenyl ether (ODA) and pyromellitic dianhydride (PMDA) were used as monomers. Carbon nanofiber (CNF) was used as the reinforcing agent. CNF reinforced polyimide (PI) composite aerogels were prepared with acidified CNF (a-CNF) via sol-gel process followed by freeze-drying technology. The morphologies, thermal insulation, microwave absorption as well as compression properties of PI composite aerogels were characterized. The results show that the volume of PI composite aerogels is shrunk from 45.52% to 35.32%, and the density is decreased from 0.084 g/cm 3 to 0.069 g/cm 3 with the increase of a-CNF content. The composite aerogels exhibit bigger pore sizes and wider pore size distribution after the introduction of a-CNF as well. CNF in PI matrix play roles for reducing the shrinkage of PI composite aerogels, thereby the thermal conductivity is reduced. Additionally, the reflection loss (RL) of PI composite aerogel with 15%(mass fraction) of a-CNF (15% CNF/PI) reaches -9.7 dB at 8.3 GHz. This is due to the fact that the introduction of CNF induced the conduction loss and the porous structure of aerogels provides better impedance matching. The compressive strength and modulus of PI composite aerogels with 15% of a-CNF content are increased by approximately 1.5 times and 2 times compared with pure PI aerogel, respectively.
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Research progress in joining of carbon fiber-reinforced polymer composites and aluminum/magnesium alloys
JIN Qihao, CHEN Juan, PENG Liming, LI Ziyan, YAN Xi, LI Chunxi, HOU Chengcheng, YUAN Mingyang
Journal of Materials Engineering    2022, 50 (1): 15-24.   DOI: 10.11868/j.issn.1001-4381.2021.000524
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The lightweight of vehicles is one of the important means to solve the energy crisis and environmental problems, which has been paid great attention by scholars at home and abroad.Carbon fiber-reinforced polymer (CFRP) composites and light alloys such as aluminum and magnesium alloys have a series of excellent mechanical properties and processing performance, representing lightweight materials with great application prospects. It has become a hot research topic to realize the effective joining between the CFRP and aluminum/magnesium alloys which are the promising lightweight materials. However, due to the significant differences in physical and chemical properties between these dissimilar materials, the mixed application of a variety of lightweight materials in the production process is still facing great challenges.The research progress, advantages and disadvantages, and development trend of bonding, mechanical fastening, friction stir welding and its variants were summarized and analyzed. The micro morphology of joints obtained under different bonding methods was investigated. Three mechanisms of friction stir joining between CFRP and aluminum/magnesium light alloys were preliminarily summarized through investigating the micro morphology of joints, including macro anchoring, micro mechanical chimerism and chemical bonding. Finally, based on the above joining mechanism, it is pointed out that the key to further improving the performance of hybrid joints is to increase the surface roughness of the base metal, increase the area of the molten polymer and adopt the hybrid joining techniques.
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Research progress in corrosion resistance of biomedical magnesium alloys
WANG Rong-xiang, HONG Li-xin, ZHANG Xiao-bo
Journal of Materials Engineering    2021, 49 (12): 14-27.   DOI: 10.11868/j.issn.1001-4381.2021.000292
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Biomedical magnesium alloys exhibit high specific strength, low density, proper elastic modulus, biodegradability,good biocompatibility and biomechanical compatibility,thus show extensive application perspective in bone fixation and cardiovascular stent.However, fast and nonuniform corrosion of magnesium alloys may easily cause the premature loss of mechanical integrity that restricts their clinical application in load bearing. In this paper, the research progress of magnesium alloys was systematically reviewed from the aspects of corrosion modes, the intrinsic and external factors affecting corrosion resistance, improvement of intrinsic corrosion resistance and surface modification, and the future development trend of corrosion resistance of biomedical magnesium alloys was prospected. On the one hand, the corrosion resistance of magnesium alloys can be improved by means such as low alloying, high purification and fine crystallization. On the other hand, reliable coatings are designed from the aspects of corrosion resistance, antibacterial and drug loading. In addition, corrosion media, flow field, stress and other in-body service factors should be considered comprehensively to study the corrosion degradation behavior and mechanism of magnesium alloy implanted devices.
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Research progress in core materials of electronic skin and applications in field of life and health
Sheng ZHANG, Junyan ZENG, Fangfang SHANG, Xiangqiong ZENG
Journal of Materials Engineering    2022, 50 (2): 23-37.   DOI: 10.11868/j.issn.1001-4381.2021.000318
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Human skin can sense the information from the environment and play a significant role in the contact with the outside world. Electronic skins, which mimic the characteristics of human skin and the ability to perceive the environment have a wide range of applications in the fields of medical monitoring, bionic prostheses and robotic tactile perception. Compared with traditional wearable sensors, electronic skin is lighter, more flexible, more malleable, and has the characteristics of wireless, transparent, and compatibility with human skin, therefore, has become one of the emerging research fields. The electronic skin can continuously sense large number of physical and biochemical parameters of the human body, human motion and gas to monitor human health, sports condition and surrounding gases in various environments in real-time. In this review, the state-of-the-art of the materials used to making electronic skins, including zero-dimensional (0D), one-dimensional (1D), two-dimensional (2D) and three-dimensional (3D) micro/nano-materials, polymeric materials, hydrogel materials and their composites, were discussed, and the practical applications of the electronic skin constructed based on these core materials were concluded in terms of health monitoring, motion monitoring as well as gas monitoring. It was pointed out that there are still some remaining technical problems in the research process of electronic skin such as high cost and complex process.The development trend of electrode skin was towards multi-function and simultaneous detection of multiple external stimuli, and it had broad application prospects in the fields of medical equipment robbotics and future manufacturing.

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Research status in processing biomorphic carbon-ceramic matrix composites
Guoqing LI, Lixia YANG, Min YU
Journal of Materials Engineering    2022, 50 (10): 1-14.   DOI: 10.11868/j.issn.1001-4381.2021.000171
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In recent years, carbon-ceramic matrix composite materials have become a hot topic due to their high temperature resistance, low density, good corrosion resistance, low thermal expansion coefficient, and strong performance design. Biomorphic carbon-ceramic composites have been prepared by introducing the wood-derived pore structure into ceramic matrix.The pore structure, preparation process, properties and application prospects of biomorphic carbon-ceramic matrix composites were reviewed. The importance of designing the microstructure of materials was emphasized, and the key technology in the preparation process of carbon-ceramic matrix composites-infiltration technology were specified, including: chemical vapor infiltration, melt infiltration, sol-gel infiltration, slurry infiltration, polymer precursor infiltration, and molten salt infiltration. The solutions to the existing problems of each technology were proposed. Composite strength and fracture strength of biomass carbon-ceramic matrix composites were reviewed. Suggestions for future research directions on the performance were put forward. It was pointed out that the mechanical properties of materials should be tested under high temperature, strong acid and strong alkali, and alternating cold and heat environments. The potential applications of biomorphic carbon-ceramic matrix composites were discussed in three aspects, including aero-engine blades, automobile exhaust gas purifiers, and catalyst carriers. Existing challenges and practical limitations such as complex molding, strong mechanical properties and thermal stability were outlined. Finally, the improvement of the preparation process and the study of mechanical properties of biomorphic carbon-ceramic matrix composites were prospected, which provides theoretical basis and guidance for the development and application of biomorphic carbon-ceramic matrix composites.

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Research progress in application of two-dimensional nanomaterials MXenes and its composites in electrocatalysis field
WANG Jiajia, YU Lanlan, HU Xia, LIU Baojun
Journal of Materials Engineering    2022, 50 (1): 43-55.   DOI: 10.11868/j.issn.1001-4381.2020.001060
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MXenes, as a new 2D transition metal carbides/nitrides/carbonitrides, have wide potential application in physics, chemistry, material science and nanotechnology fields. Since MXenes inevitably possess defects and —O, —OH, —F terminal groups during the preparation, behaving high conductivity and large surface area, MXenes have a good electron transfer rate and can be used as an excellent electrochemical catalyst. In this review, the various synthesis methods and development of different doping types of MXenes were introduced. The application and mechanism of MXenes in electrocatalytic hydrogen production, oxygen production, oxygen reduction, CO 2 reduction and nitrogen reduction processes were mainly discussed. It was pointed out that the preparation methods of MXenes should possess the characteristics of environmental friendliness, morphology controllability, the inoxidizability and high adjustability, meanwhile, different types of MXenes should be applied to different electrocatalytic reactions.
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Research progress in tribological property of dental ceramics
Lei LEI, Yuchi WU, Zijin CHENG, Li LIU, Jing ZHENG
Journal of Materials Engineering    2022, 50 (2): 1-11.   DOI: 10.11868/j.issn.1001-4381.2021.000295
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Ceramics are widely used as dental restorative materials because of their superior wear resistance, chemical stability, biocompatibility, and aesthetic features. In this paper, the chemical compositions, microstructures and mechanical properties of dental ceramics were introduced, based on the wear mechanisms of typical dental ceramics and their abrasiveness with opposing human teeth, the main progress concerning the tribological performance optimization of dental ceramics were summarized, and it was pointed out that the mismatch of tribological properties between ceramics and human teeth seriously restricts the clinical application of dental ceramics. Then the in vitro test methods of tribological properties of dental ceramic materials are analyzed and summarized from the aspects of laboratory test medium, friction pair, load, displacement and cycle times. Finally, the future development trends of dental ceramics were discussed from the perspective of bionic tribology. It was pointed out that bionic design of ceramic matrix composites is a promising strategy for overcoming the mismatch of tribological property between dental ceramic restorations and human teeth.

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Research progress in degradable hydrogels as articular cartilage repair materials
Xiaofang WU, Kai CHEN, Dekun ZHANG
Journal of Materials Engineering    2022, 50 (2): 12-22.   DOI: 10.11868/j.issn.1001-4381.2021.000193
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Degradable hydrogels are widely used in the repair and regeneration of articular cartilage because of their good biocompatibility and biodegradability. Three application strategies of degradable hydrogels in cartilage tissue engineering were focused in this review. Firstly, the proteoglycan materials and nanocomposite materials for in-situ formed injectable hydrogels were reviewed. Secondly, the advantages and disadvantages of traditional technology for tissue engineering scaffolds and the preparation methods of combination of various technologies were systematically summarized. Importantly, the research progress of 3D printed tissue engineering scaffolds from pure cartilage to bone/cartilage integration, from single layer to multi-layer in recent years were summarized. Finally, the limitations of degradable hydrogel as articular cartilage scaffold material in micro-directional structure and bioactivity functionalization were discussed.It was prospected that developing highly biomimetic gradient scaffolds with multi-material, multi-scale and multi-inducement will be an important research direction of articular cartilage tissue engineering in the future.

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Research progress in high-performance soft magnetic alloys
Zhiyao JI, Yue MA, Qing WANG, Chuang DONG
Journal of Materials Engineering    2022, 50 (3): 69-80.   DOI: 10.11868/j.issn.1001-4381.2021.000299
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Soft magnetic materials have been widely applied in modern industries as energy materials. In recent years, with the increasingly high frequency and miniaturization of magnetic components, as well as the call of energy conservation and environmental protection, the development and research of high-performance soft magnetic material are of great important significance. The present work generalized the development history of soft magnetic alloys comprehensively, from the viewpoints of chemical compositions, microstructures, magnetic properties, application fields, and advantages and disadvantages of different soft magnetic alloys. The involved alloy systems include primarily traditional crystalline alloys, amorphous/nanocrystalline alloys, and high entropy alloys. It is found that the microstructure induced by alloy compositions plays a dominant role in soft magnetic property, especially the coercivity. Then the influence factors on the coercivity of alloys and the related micro-mechanisms were discussed, in which the grain size in traditional alloys or particle size in nano-crystalline alloys is crucial to achieve lower coercivity. Therefore, the development of the micro-mechanisms of coercivity in high entropy soft magnetic alloys was described. Finally, it was expected that high entropy soft magnetic alloys would be more beneficial to modulate alloy properties due to the diversification of microstructures induced by the mixing of multi-principal elements, which shows great potential to serve as a new generation of high temperature soft magnet materials.

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Research progress in formation mechanism of precursor film at high temperatures
Lu LIU, Wenqi ZHU, Qiaoli LIN
Journal of Materials Engineering    2022, 50 (5): 1-10.   DOI: 10.11868/j.issn.1001-4381.2021.000277
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The formation mechanisms of the precursor film (PF) at high temperature were reviewed, i.e., surface diffusion mechanism, evaporation-condensation mechanism, subcutaneous infiltration mechanism, and rapid absorption then film overflow mechanism. In the experimental metallic systems, the most possible mechanism is the subcutaneous infiltration mechanism, which is related to the apparent contact angle, contact radius, height of gap between the substrate metal and oxide film. In the metal/ceramic system, the formation of precursor film is usually rapid absorption then film overflow mechanism. The appearance of PF for adsorption mechanism needs to meet the contradiction of relative inertia and high affinity at the liquid/solid interface. Meanwhile, another possible mechanism of precursor film in high temperature reactive wetting system, namely film transport mechanism, is introduced. It was pointed out that the difficulty of studying precursor film lies in the unpredictability and instability of precursor film, and its development direction should be systematic, and the corresponding theoretical model should be established.

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High temperature oxidation behavior of refractory high entropy alloys NbMoTaWTi/Zr
WANG Xin, WAN Yi-xing, ZHANG Ping, SHAN Cai-xia, XIE Ying-ying, LIANG Xiu-bing
Journal of Materials Engineering    2021, 49 (12): 100-106.   DOI: 10.11868/j.issn.1001-4381.2020.000917
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Refractory high entropy alloys NbMoTaWTi and NbMoTaWZr were prepared by vacuum arc melting.The microstructure and component distribution characteristics were analyzed, and the dynamic behavior during room temperature to 1500℃,as well as the isothermal oxidation behavior at 1200℃ were studied. Results reveal that NbMoTaWTi mainly consists of single body-centred cubic (BCC) phase, and NbMoTaWZr is composed of BCC and Zr-rich phases.These two alloys are both seriously oxidized above 700℃. Comparatively, NbMoTaWTi alloy is superior to NbMoTaWZr in antioxidation below 1300℃.For both two alloys, the oxygen diffusion inward mainly occurs during isothermal oxidation at 1200℃ and catastrophic oxidation takes place after 3 h. The Ti and Zr addition cannot cause selective oxidation. Although these two elements form a composite oxide layer with other refractory metal oxides, the density and the ability to prevent oxidation is not enough.
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Tribology research progress of functional fillers modified polymer materials
Changxin WAN, Shengpeng ZHAN, Hui CHEN, Yinhua LI, Dan JIA, Jian LI, Haitao DUAN
Journal of Materials Engineering    2022, 50 (2): 73-83.   DOI: 10.11868/j.issn.1001-4381.2021.000435
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Polymer materials are widely used in the mechanical lubricant field owing to their light, low-cost, anti-corrosion, and excellent self-lubricating performance. Adding functional fillers with anti-friction and reinforcing character can overcome the inherent defects of intrinsic polymer materials and then obtaining tribological composites materials with the low friction coefficient, high-wearing, high-bearing, and heat-resisting performance. The anti-friction and anti-wear effect and mechanism of composites by adding functional fillers such as carbon-based materials, transition metal sulfides, microcapsules, soft metals, ceramic nanoparticles, mineral salts, and self-lubricant polymer materials were summarized in this paper. Meanwhile, the mechanical property is the key parameter that can guarantee the service performance and application deadline of polymer materials and also gives the significant influence of tribological performance. The enhanced and toughening mechanism of composites by adding nanoparticles and fiber was also mainly discussed in this paper. Finally, The synergistic effect of functional fillers on mechanical and tribological properties was prospected, as well as the development trend of computer simulation in tribology of composite materials.

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Research progress in effect of alloying elements on corrosion resistance of magnesium alloys
YIN Ming, SUN Jun-li, BAO Tong-yao, LIU Xiao-da, DU Hua-yun, WEI Ying-hui, HOU Li-feng
Journal of Materials Engineering    2021, 49 (12): 28-39.   DOI: 10.11868/j.issn.1001-4381.2021.000289
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As the lightest metal structural materials, magnesium and its alloys have great potential to achieve lightweight products in the future. However, magnesium has a high corrosion sensitivity, and the magnesium hydroxide film formed on the surface is loose and porous with little protection, which leads to its application being limited. How to improve the corrosion resistance of magnesium has become a worldwide problem that restricts its application. Alloying is one of the ways to radically improve the corrosion resistance of magnesium alloys. In this paper, the corrosion mechanisms of pure magnesium and the mechanisms of alloying elements on the corrosion performance of magnesium alloys are described in terms of the influence of alloying elements on the corrosion resistance of magnesium and its alloys. In addition, protection mechanisms produced by alloying elements on magnesium alloys were compiled, and the protection mechanisms and corresponding characteristics of beneficial elements on magnesium alloys were summarized. This can provide some reference for the development of new magnesium alloys and the improvement of the corrosion resistance of magnesium alloys. In addition, this paper contributes to a better understanding of the corrosion behavior of magnesium alloys. At present, there is no magnesium alloys can be as good as aluminum alloys or stainless steels corrosion resistance, so the development of corrosion-resistant magnesium alloys needs further research. This paper provides a theoretical basis for the interaction between elements in magnesium alloys, which can provide ideas for the development of new corrosion-resistant magnesium alloys. The synergy between the elements will have a significant impact on the design, process and performance of new corrosion resistant magnesium alloys, and as the research progresses, it is expected that new corrosion-resistant magnesium alloys similar to "stainless steel" will be constructed.
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Research progress in effect of Ru on solidification characteristics, precipitation of topologically close-packed phases and creep property of nickel-based single crystal superalloy
CAO Kaili, YANG Wenchao, QU Pengfei, HUANG Taiwen, GUO Min, SU Haijun, ZHANG Jun, LIU Lin
Journal of Materials Engineering    2022, 50 (1): 80-92.   DOI: 10.11868/j.issn.1001-4381.2020.001084
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Nickel-based single crystal superalloys are widely used for hot components of advanced turbine engines due to their excellent mechanical properties at elevated temperature. Ru is the symbol element of the fourth and fifth generation nickel-based superalloys. During the past decades, many efforts have been made to provide insight into the role of Ru addition in superalloys. In this paper, the research progress in the effect of Ru on the solidification characteristics, as-cast microstructures, precipitation of topologically close-packed (TCP) phases, and creep properties of nickel-based single crystal superalloy was reviewed. The effect of Ru on the solidification characteristics such as solidification path, solidification transition temperature, micro-segregation, and the solidification microstructures such as eutectic, carbide were analyzed systematically. And the reasons why the addition of Ru can inhibit the precipitation of TCP phase and improve the creep property of superalloy were emphatically studied. The composition design and optimization of Ru-containing superalloy are more challenging due to the complexity of the multi-component interaction on microstructure and properties. It was suggested that the future research on Ru-containing superalloys could be explored from the following aspects: the cause of the precipitation of the new Ru-rich phases and the method of inhibiting its precipitation, the effect of Ru addition on solidification defects, the mechanism of the interaction between Ru and other elements on the "reverse partitioning effect" and the precipitation of TCP phases. It could provide significant guidance for the composition optimization and performance improvement of the new Ru-containing nickel-based single crystal superalloys.
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Progress in application of nanomaterials mimic enzymes
Peng WU, Cheng CHEN, Xueling ZHAO, Donghai LIN
Journal of Materials Engineering    2022, 50 (2): 62-72.   DOI: 10.11868/j.issn.1001-4381.2021.000073
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Natural enzymes are trace proteins produced by living cells in human body. It is precisely because of the existence of enzyme that the daily operation of organisms can be carried out orderly. At present, enzymes are used in many fields such as biomedicine, catalysis and detection. However, natural enzymes have many disadvantages, such as easy inactivation, poor stability, difficult synthesis, complex purification and high price, which hinder the large-scale application. In the past decades, as a new generation of artificial enzymes, nanomaterials mimic enzymes has gradually become a substitute for natural enzyme due to their high stability and good repeatability. Nanomaterial mimetic enzymes play an important role in many fields. The application of nanomaterial mimetic enzymes in the detection of O2·- and salvianolic acid in the field of electrochemical sensing was focused on in this paper, as well as in the detection of small biological molecules such as glutathione, glucose, cholesterol and H2O2, which can effectively detect the content of heavy metal salts and pesticides in the field of environmental pollution prevention and control, nanomaterials mimic enzymes can also prevent cancer, virus infection and other diseases by detecting specific sequences of DNA. Finally, it was expected that the future research of nanomaterials mimic enzymes will focus on the coupling between nanomaterials mimic enzymes, reaction mechanism, optimization of enzyme reaction environment and substrate selectivity, which will be the key research direction in the future.

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Research progress in biomimetic gradient scaffolds for osteochondral tissue engineering
Li WAN, Haimang WANG, Xu CAI, Keming HU, Wen YUE, Hongyu ZHANG
Journal of Materials Engineering    2022, 50 (2): 38-49.   DOI: 10.11868/j.issn.1001-4381.2021.000185
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Osteochondral defects are the main cause of joint morbidity and disability in elderly patients, and osteochondral tissue engineering is one of the methods to repair osteochondral defects. The method of osteochondral tissue engineering involves the manufacture of osteochondral biomimetic gradient scaffolds that should mimic the physiological properties of natural osteochondral tissue (e.g., the gradient transition between cartilage surface and subchondral bone). The osteochondral biomimetic gradient scaffolds exhibit discrete gradients or continuous gradients to establish the characteristics of osteochondral tissue in many studies, such as biochemical composition, structure and mechanical properties. An advantage of the continuous osteochondral biomimetic gradient scaffold is that there is no obvious interface between each layer, therefore it more closely mimics the natural osteochondral tissue. Although promising results have been achieved so far on the regeneration of the osteochondral biomimetic gradient scaffold, there are still differences between the osteochondral biomimetic gradient scaffold and natural osteochondral tissue. Due to these differences, the current clinical treatment of osteochondral biomimetic gradient scaffolds to repair osteochondral defects needs further research. Firstly, the research progress on discrete and continuous gradient scaffolds from the background of osteochondral defects, the micro-scale structure and mechanical properties of osteochondral to the materials and methods related to the manufacture of osteochondral biomimetic gradient scaffolds was summarized in this article. Secondly, due to the 3D printing method of the osteochondral biomimetic gradient scaffold having the ability to precisely control the geometry of the scaffold hole and the mechanical properties of the scaffold, the application of computational simulation models in osteochondral tissue engineering was further introduced, for example, optimizing scaffold structure and mechanical properties are considered to predict tissue regeneration. Finally, the challenges related to the repair of osteochondral defects and prospects for the future research of osteochondral tissue regeneration were presented.For example, continuous osteochondral bionic gradient scaffolds need to more similarly simulate the structure of natural osteochondral tissue units, that is, the transition of mechanical properties and biochemical properties is more smooth naturally. At the same time, although most osteochondral biomimetic gradient scaffolds have achieved good results in in vivo and in vitro experiments, clinical research and application still need to be further studied.

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Preparation and property of epoxy composites reinforced by three-dimensional graphene-pyrrole aerogel
WANG Mu, ZENG Xiamao, MIAO Xia, WEI Haoguang, ZHOU Shiming, FENG Anchao
Journal of Materials Engineering    2022, 50 (1): 117-124.   DOI: 10.11868/j.issn.1001-4381.2020.001180
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Lightweight and cellular-structured graphene-pyrrole (G-P) aerogels /epoxy composites were prepared basing on the three-step fabrication process which involving infiltration of epoxy resin into G-P aerogels under vacuum atmosphere. The microstructure of G-P aerogels possesses uniform three-dimensional structure, which can also be preserved well in epoxy composite. The three-dimensional interconnected graphene network serves as fast channels for charge carriers. The conductive property of the composite is improved significantly, 67.1 S/m with only 0.23%(mass fraction) filler content (1G-1%P, 1300 ℃). The electromagnetic interference shielding effectiveness (EMI SE) of the composite (1G-1%P, 1300 ℃) can reach 33 dB in the frequency range of 8-12 GHz. More importantly, the G-P aerogel network also enhances the mechanical properties of epoxy matrix. Flexural strength and flexural modulus are increased by 60.93% and 25.98% respectively (10G-5%P, 180 ℃). Implication of the results suggests that the three-dimensional structure is an effective method for preparing composites with both excellent EMI SE and mechanical properties.
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Hydrogen evolution, efficiency and exacerbated galvanic corrosion damage of magnesium alloy anode
HUANG Ju-feng, SONG Guang-ling
Journal of Materials Engineering    2021, 49 (12): 48-56.   DOI: 10.11868/j.issn.1001-4381.2021.000287
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To address the galvanic corrosion issue that is critically limiting the practical application of Mg alloys, the negative difference effect (NDE), anodic dissolution efficiency, and anodic hydrogen evolution were investigated by means of the hydrogen collection, Mg wire array electrode, and surface microanalyses based on the model of monovalent Mg + dissolution at film breaks. The results show that anodic hydrogen evolution is closely associated with the negative difference effect, while the micro-galvanic process of Mg is not responsible for the low anodic current efficiency, and the secondary effect of dissolved zinc ions can to some degree reduce the anodic current efficiency. The protectiveness of the surface film is the most important factor determining the current efficiency, anodic hydrogen evolution, and galvanic corrosion damage.
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Research progress on corrosion resistance of magnesium alloys in aspect of element solid-solution and precipitation
JIANG Shi-yu, YUAN Yuan, CHEN Tao, GU Da-chong
Journal of Materials Engineering    2021, 49 (12): 40-47.   DOI: 10.11868/j.issn.1001-4381.2021.000286
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The solid solution and precipitations of alloying elements can change the chemical potential of the primary phase and the species of the second phase, which can significantly affect the micro-galvanic corrosion behaviors of magnesium alloys. The influence of solid solution and precipitation on corrosion resistance of magnesium alloys was reviewed.Based on the thermodynamics and dynamics analysis, the effect of solution and precipitation behavior on corrosion behavior of common magnesium alloys was summarized.The necessary conditions for a good candidate material of magnesium alloy were pointed out, and the design method for improving the intrinsic corrosion resistance of magnesium alloy was proposed.Future research should focus on reducing the corrosion rate of magnesium alloys and expanding the application range of magnesium alloys by regulating the types and quantities of alloying elements in magnesium alloys.
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Research status of crack inhibition via grain refinement of high-strength aluminum alloys fabricated by selective laser melting
Xiaohui LIU, Yunzhong LIU
Journal of Materials Engineering    2022, 50 (8): 1-16.   DOI: 10.11868/j.issn.1001-4381.2022.000160
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High-strength aluminum alloys (2××× and 7×××, etc.) are widely used in aerospace, automobile and other fields because of their high specific strength and good machinability. With the development of high thrust-weight ratio engine and automobile lightweight technology, the demand for lightweight structural materials is increasing. Meanwhile, parts also present the "thin-walled, hollow and composite" tendency gradually, and the traditional processing methods of high-strength aluminum alloy are increasingly difficult to meet the requirements. As a common metal additive manufacturing (AM) technology, selective laser melting (SLM) is a great potential manufacturing technology for complex parts. SLM is expected to become an emerging technology to expand the application of high-strength aluminum alloys. However, due to their poor casting and welding properties, high-strength aluminum alloys easily produce the periodic hot cracks and coarse columnar grains during SLM, leading to unsatisfactory mechanical properties. Grain refinement is the key to overcome the inherent hot-tearing crack of SLMed high-strength aluminum alloys. The research progress in microstructure and mechanical property control of SLMed high-strength aluminum alloys in recent years was reviewed. The mechanical properties of alloys with different compositions were summarized. Importantly, the main strategies to suppress hot-crack formation in SLMed high-strength aluminum alloys were highlighted, including optimization of SLM process parameters and grain refinement by microalloying or addition of nanoparticles. It was pointed out that the main issue of SLMed high-strength aluminum alloys was the change of alloy composition on the comprehensive properties and heat treatment process was still unclear. The development trends were forecasted, such as designing new high-strength aluminum alloys and evaluating their comprehensive performances, using post-treatment process and other means to further improve the comprehensive performances of the alloys, and designing special grain refiners for SLM and investigating refinement mechanism.

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Research progress in low-temperature discharge performance of Ni-rich ternary lithium-ion batteries
Fujuan HAN, Zenghua CHANG, Jinling ZHAO, Rennian WANG, Haiyang DING, Shigang LU
Journal of Materials Engineering    2022, 50 (9): 1-17.   DOI: 10.11868/j.issn.1001-4381.2021.000485
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With the rapid development of the new energy automotive industry, consumers' requirements for the range of electric vehicles have been increasing. The Ni-rich ternary lithium-ion battery has become the most promising power battery in electric vehicles due to its high specific energy, but the battery system still faces the problem of poor performance at low temperature.The research progress on low temperature performance of Ni-rich ternary power battery in recent years was summarized in this review. The influence factors on the low temperature performance of Ni-rich ternary power battery were summarized emphatically. On the one hand, the effects of low temperature performance from thermodynamics were analyzed, including the structural change of the Ni-rich ternary cathode materials and graphite anode materials, electrolytic phase transformation and solvation structure changes, and glass transition of binder. On the other hand, rate controlling step in the low temperature discharge process in the Ni-rich ternary lithium-ion battery was summed up. According to this, main modification measures of low-temperature performance in Ni-rich ternary power battery were summarized. Low temperature electrolyte was designed by optimizing solvents, improving lithium salts and applying new additives. In order to improve the low temperature performance of electrode materials, three methods were mainly employed: substitution, surface modification and smaller material particle size. The remaining shortcomings of the research on low-temperature performance of the battery were summarized, and the research on the low temperature thermodynamic characteristics of batteries is not clear enough. In addition, the research methods for the low temperature kinetic process of batteries are single, and the influence of the reaction sequence in batteries is insufficiently understood.

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Ultrasonic vibration enhanced friction stir welding process of aluminum/steel dissimilar metals
WU Chenghao, LIU Tao, GAO Song, SHI Lei, LIU Hongtao
Journal of Materials Engineering    2022, 50 (1): 33-42.   DOI: 10.11868/j.issn.1001-4381.2021.000338
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A novel ultrasonic vibration enhanced friction stir welding (UVeFSW) process was employed to join the 6061-T6 aluminum alloy and QP980 high-strength steel. The macro morphology, microstructure and tensile shear properties of the joint with or without ultrasonic energy were compared and analyzed. Meanwhile, the effects of ultrasonic energy on the welding load were studied. The results show that the ultrasonic vibration applied to the base metal before welding can soften the base metal, promote the plastic flow of the material, expand interface zone and nugget zone of the aluminum/steel, make more steel particles rotate into the aluminum alloy side with the stirring needle, forming a hook structure at the edge of the interface zone which can improve the failure load of the joint. The fracture position and fracture morphology of FSW joint are changed by ultrasonic, and the mechanical properties of FSW joint are improved. Under the welding parameters conducted in the experiment, the maximum average failure load of the joint is 4.99 kN. Under the conditions of a welding rate of 90 mm/min and a depth of 0.1 mm, the application of ultrasonic vibration makes the average failure load of the joint increase by 0.98 kN and the tensile shear performance increase by 28.24%. After applying ultrasonic vibration, the axial force Fz, the tool torque M t and the spindle power decrease by 2.46%, 6.44% and 4.59% respectively.
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Research progress of polymer composite system in solid electrolyte
Changyi DONG, Demei YU
Journal of Materials Engineering    2022, 50 (4): 15-35.   DOI: 10.11868/j.issn.1001-4381.2021.000442
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Because of its light weight, flexibility, and good contact with electrode, solid polymer electrolyte (SPE) has become a potential material for the development of electrochemical devices with high energy density, high safety and high flexibility, and has been paid extensive attention in recent years. However, defects such as low ionic conductivity and poor mechanical properties have also become the problems that limit its further commercialization. It is possible to solve these problems by forming a composite system of polymers by means of crosslinking, blending, copolymerization, etc. Therefore, in this paper, the mechanism of ionic conductivity in polymers was briefly introduced in order to explain the strategies to solve the above problems from the point of principle. Then, the applications and modification strategies of a variety of polymer-based composite electrolytes in electrochemical devices in recent years were reviewed. Finally, the problems of basic research and practical application faced currently by the composite SPEs were discussed and the solutions to these problems were given. It is hoped that this review can provide ideas for the design and preparation of future composite SPEs.

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Fabrication, microstructure and property of AZ31/7075 composites with Zn intermediate layer
Hui YU, Junchao REN, Xin YANG, Shulong GUO, Wei YU, Jianhang FENG, Fuxing YIN, Kwangseon SHIN
Journal of Materials Engineering    2022, 50 (3): 157-165.   DOI: 10.11868/j.issn.1001-4381.2021.000140
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AZ31/7075 composite with the addition of Zn foil (about 100 μm in thickness) in the dissimilar material interface was successfully fabricated by pre-extrusion+caliber rolling composite process. The microstructure evolution especially for the composite interface was characterized by optical microscopy (OM), scanning electron microscopy (SEM) with energy dispersive spectrometer (EDS) and the microhardness test was also performed. The effect of the Zn intermediate layer on the product during the extrusion and caliber rolling was explored. The results show the hard 7075 Al alloy as the core can refine the grain size of AZ31 alloy. In addition, introducing Zn intermediate layer can reduce or completely avoid the formation of Mg-Al intermetallic compounds. The temperature increased by extrusion and deformation results in the remelting of eutectic Mg-Zn phase, and the diffusion of both elements from the solid to the liquid phase are accelerated. However, discontinuous cracks can be observed in the Mg-Zn diffusion layer but will be healed after caliber rolling. The MgZn2 intermetallic compound generated at Mg-Zn diffusion layer has high hardness (161HV), but the overall hardness of bonding layer is not changed a lot due to thinner thickness of the Mg-Zn diffusion layer after deformation.

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Corrosion resistance of cold sprayed aluminum/micro-arc oxidation composite coating on AZ80 magnesium alloy
LI Zhong-sheng, WU Hu-lin, DING Xing-xing, HUANG An-wei, SONG Kai-qiang, ZHAN Qing-qing, CONG Da-long
Journal of Materials Engineering    2021, 49 (12): 57-64.   DOI: 10.11868/j.issn.1001-4381.2021.000294
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A layer of pure aluminum coating was prepared on AZ80 magnesium alloy by cold spray, and then a pure aluminum/aluminum oxide composite coating was successfully fabricated on the surface of pure aluminum coating by micro-arc oxidation. The surface and cross-section morphology, composition and phase structure of the coatings were analyzed by scanning electron microscope (SEM), energy spectrometer (EDS) and X-ray diffractometer (XRD). The corrosion behavior of the coatings immersed in 3.5%NaCl(mass fraction) solution for different time (30 min and 7 days) was investigated using potentiodynamic polarization curves and electrochemical impedance spectroscopy. The results show that after 30 minutes of immersion, the corrosion current densities of the pure aluminum coating and the pure aluminum/aluminum oxide composite coating are 3.7×10 -6 A·cm -2 and 8.0×10 -7 A· cm -2, respectively; after 7 days of immersion, the corrosion current densities are 9.0×10 -6 A·cm -2 and 1.8×10 -6 A·cm -2, respectively. Both the pure aluminum/aluminum oxide composite coating and the cold sprayed aluminum coating can effectively delay the corrosion of the magnesium alloy substrate. Among them, the corrosion resistance of the micro-arc oxidation composite coating is nearly 5 times of the cold sprayed pure aluminum coating. The further improvement in corrosion resistance is attributed to the excellent physical barrier effect of the micro-arc oxidation ceramic layer.
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Research progress and existing problems of photocathodic protection technology
CHEN Fan-wei, LIU Bin, JIAN Dong-hui, LIU Si-qi, LIU Shu-hui, XU Da-wei
Journal of Materials Engineering    2021, 49 (12): 83-90.   DOI: 10.11868/j.issn.1001-4381.2021.000469
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In this paper, the research status of photocathodic protection in broadening light absorption range, enhancing electron-hole separation rate and conduction efficiency of electrons, and realizing protection in the dark were discussed. Six modification methods were summarized, including modification of conductive polymers, construction of heterojunction, composition with two-dimensional conductive materials, adjustment and control of topography, doping with metal or non-metallic elements and coupling with energy storage semiconductors. The problems,such as short duration of protection in the dark and low repeatability of some experiments, were pointed out. The unsolved technical difficulties, such as overcoming insufficient natural light intensity, the harsh conditions of electrolyte solution and the complexity of photocathodic protection system design, were analyzed. Finally, several solutions to above problems were proposed, such as the development of semiconductor materials driven by natural light, the preparation of colloidal electrolyte and capsule material for storing electrolyte, and the design of photocathodic protection coatings.
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Research progress in carbon nanotube/paraffin phase change composites
DAI Yuan-zhe, TANG Bo, ZHANG Zhen-yu, REN Shou-long
Journal of Materials Engineering    2021, 49 (12): 91-99.   DOI: 10.11868/j.issn.1001-4381.2020.000515
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Paraffin phase change composite material (PPCCM) has attracted increasing attention and research from scholars at home and abroad because of its excellent latent heat value and high energy storage density. As an important class of medium and low temperature phase change materials, PPCCM is the first choice to prepare room temperature and low-temperature composite phase change materials. However, the risk of low thermal conductivity and some defects are obstacles for the industrialization of PPCCM. Due to the unique structure of carbon nanotubes (CNTs) with complex coils and excellent thermal conductivity, CNTs is considered as one of the important candidate materials that are expected to improve the thermal performance of PPCCM significantly. Therefore, the combination of CNTs and paraffin has become a hot issue. In this review, according to the current research status of CNTs and PPCCM in the past few years, the preparation, microencapsulation and practical application were systematically summarized. The challenges(complex preparation process, poor stability, few actual evaluation, etc.) and possible research priorities(doping ratio, wettability, economy, etc.) were also discussed.
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Preparation and properties of sulfide solid state electrolyte Li 6PS 5Cl by ball milling-solid phase sintering
Na LYU, Zhen SUN, Yaqi HU, Bingqin LI, Shenghao JING, Zongliang ZHANG, Liangxing JIANG, Ming JIA, Fangyang LIU
Journal of Materials Engineering    2022, 50 (2): 103-110.   DOI: 10.11868/j.issn.1001-4381.2021.000264
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Li6PS5Cl (LPSC), a sulfide solid-state electrolyte with an argyrodite structure, is one of the ideal electrolyte materials for the construction of all-solid-state lithium-ion batteries.It has good development prospects because of its high ionic conductivity (>3×10-3 S·cm-1) and good stability to lithium. In this work, LPSC was prepared by the combination of high-energy ball milling and inert atmosphere solid-phase sintering, and powder X-ray diffraction, Raman spectra, and scanning electron microscopy were used to investigate the effects of the preparation process on the structure, composition, electrical properties, and ion conductivity of LPSC. The results show that the extended ball milling time is beneficial to the amorphization and subsequent sintering of the LPSC precursor powder. The increase of the sintering temperature will promote the physical purity and electrical conductivity of the prepared LPSC electrolyte, but the high sintering temperature will lead to the decomposition of LPSC. The LPSC prepared by 8 h ball milling and 500℃ sintering has the highest ion/electron conductivity ratio (2.091×105) at room temperature, with ionic conductivity up to 4.049×10-3 S·cm-1 and electronic conductivity only 1.936×10-8 S·cm-1. The 712 NCM/LPSC/In-Li all-solid-state battery prepared with this electrolyte has a first-turn discharge specific capacity of 151.3 mAh·g-1 at a charge/discharge ratio of 0.1 C, and has excellent cycling stability.

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Effect of Co on microstructure and high temperature oxidation resistance of Ti45Al-8Nb-0.3Y alloy
XIE Xiaoqing, LI Xuan, LYU Wei, LAI Sheng, LIU Yi, LI Jianjun, XIE Wenling
Journal of Materials Engineering    2022, 50 (1): 101-108.   DOI: 10.11868/j.issn.1001-4381.2021.000116
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Ti45Al-8Nb-0.3Y- mCo ( m=0, 0.5, 1, 2, atom fraction/%) alloys were prepared by vacuum arc non-consumable melting method. The microstructure and high temperature oxidation resistance of the alloys were investigated. The results show that the microstructure of TiAl-Nb alloy can be significantly refined by addition of Co element. However, Co can remarkably inhibit the formation of α 2+γ lamellar while promote the formation of Co-rich B 2 precipitations in the alloys. The oxide films formed on the Ti45Al-8Nb-0.3Y- mCo alloys mainly consist of relatively loose TiO 2 and Al 2O 3 mixtures, after oxidation at 1000 ℃ for 100 h in air. With the increase of Co content, the mass gains of the TiAl-Nb-0.3Y alloys after oxidation increase obviously, while much better anti-spalling performance of the oxide films can be obtained. Addition of Co can reduce the internal stress of the oxide film to a certain extent, which is beneficial to the anti-spalling performance of the oxide film. However, the coarse B 2 precipitation caused by Co weakens high temperature oxidation resistance of the alloy.
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Preparation and properties of TiO 2 superhydrophobic filter media modified by silane coupling agent KH570
Qing LI, Fuping QIAN, Wei DONG, Yunlong HAN, Jinli LU
Journal of Materials Engineering    2022, 50 (2): 144-152.   DOI: 10.11868/j.issn.1001-4381.2021.000006
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TiO2 sol was prepared by sol-gel method using tetrabutyl titanate as precursor and acetic acid as catalyst, and then hydrophobically modified TiO2 sol was obtained by reducing its surface energy with γ-methacryloxypropyl trimethoxysilane (KH570), the modified TiO2 sol was sprayed on the surface of the filter media to make it superhydrophobic. The wettability, surface morphology, chemical composition and filtration performance of the filter media before and after modification were analyzed.The results show that the modified coating is uniformly deposited on the surface of the filter media and the fiber surface completely wrapped, and the water contact angle of the modified filter media reaches 156.29°. By testing the filtration performance of the particles with the size of 0.3 μm at the filtration velocity of 0.043-0.127 m/s, it can be seen that the filtration efficiency of the modified filter media is increased by an average of 2.7672% compared with the unmodified filter media, and the filter quality factor is increased by 0.34%, which improves the filtration performance of the filter media. In addition, the hydrophobic filter media still has superhydrophobicity after 50 times of sandpaper abrasion cycles and 30 h acid-base solution immersion. The modified filter media has excellent self-cleaning performance by cleaning the surface of coal powder pollution.

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Research progress of hot crack in fusion welding of advanced aeronautical materials
Hong LI, Weijia YAN, Yu ZHANG, Wenbo DU, Zhuoxin LI, Bober MARIUSZ, Jacek SENKARA
Journal of Materials Engineering    2022, 50 (2): 50-61.   DOI: 10.11868/j.issn.1001-4381.2021.000676
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The high fusion welding hot cracking sensibility of the next-generation alloy is the key technological difficulty that hinders its widely application in the aeronautic and astronautic industry. A critical review of the fusion welding hot cracking from the perspective of basic mechanism and the experimental research of typical materials was presented in this article. The fusion welding hot cracking phenomena include solidification cracking (occurs within the fusion zone) and liquidation cracking (occurs at the interface between fusion zone and partial melting zone). The formation factors of the fusion welding hot cracking include alloying composition, welding thermal cycle and thermal stress. Based on the comprehensive understanding of the formation mechanism of the fusion welding hot cracking, the relative research progress in the field of aluminum alloys, magnesium alloys, advanced high strength steel and nickel alloys was summarized. The establishment of the quantitative criterion that involves the effects of complicated multi-component and the morphology of the dendrite on the cracking sensibility is the key development direction. Optimizing the alloying composition of the base metal or filler metal, adding nucleanting agent or auxiliary facilities are the practical method for restraining the fusion welding hot cracking. Conducting the research on the mechanism and restraining method of the fusion welding hot cracking helps to solve the difficulty of the next generation alloys processing, which can realize their application in the field of aeronautic and astronautic industry.

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Multi-scale modification of aerospace silicone rubber damping material with wide temperature range
MI Zhi-an, LI Xue-kuan, ZHAO Yan
Journal of Materials Engineering    2021, 49 (12): 123-129.   DOI: 10.11868/j.issn.1001-4381.2021.000856
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Silicone rubber has stable performance in a wide temperature range. However, as its damping factor in the effective damping temperature range is small and the damping performance is limited, multi-scale modification is required. Firstly, the molecular scale modification was carried out, and the molecular structure was adjusted by changing the vinyl content and the addition amount of alkylhydrosilane. The results show that the growth of the vinyl side chain and the successful grafting of the alkyl hydrogen silane on the vinyl side chain increase the barrier of motion of the molecular chain and enhance the damping performance of the silicone rubber. When the vinyl content is 15%(mass fraction,the same as below) and the molar ratio of hydrosilane to vinyl is 3:1, silicone rubber exhibits the best damping performance. On this basis, the micro-scale modification was continued. The results showed that adding phenyl hydrogen-containing silicone oil improved energy absorption efficiency because of the synergistic effect of forming π-π strong interaction bonds and increasing relaxation time. When the damping agent is added at 2%, silicone rubber exhibits the best damping performance. The effective synergy of molecular scale and micro scale significantly enhances the damping performance of silicone rubber, and the multi-scale modification strategy is suitable for preparing damping silicone materials with wide temperature range.
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